Resource Leak Checker: calling @CreatesMustCallFor("this") method from constructor

[mernst]

Consider the following code, which appears in checker/tests/resourceleak/LemmaStack.java:

// The Resource Leak Checker issues the following error:
// LemmaStack.java:37: error: [reset.not.owning] Calling method startProver resets the must-call
// obligations of the expression this, which is non-owning. Either annotate its declaration with an
// @Owning annotation, extract it into a local variable, or write a corresponding
// @CreatesMustCallFor annotation on the method that encloses this statement.
//     startProver();
//                ^
// 1 error

import java.io.Closeable;
import java.io.IOException;
import java.io.PrintWriter;
import org.checkerframework.checker.calledmethods.qual.EnsuresCalledMethods;
import org.checkerframework.checker.mustcall.qual.CreatesMustCallFor;
import org.checkerframework.checker.mustcall.qual.MustCall;
import org.checkerframework.checker.mustcall.qual.Owning;
import org.checkerframework.checker.nullness.qual.EnsuresNonNull;

@MustCall("close") public class LemmaStack implements Closeable {

  private @Owning @MustCall("close") PrintWriter session;

  @CreatesMustCallFor("this")
  @EnsuresNonNull("session")
  private void startProver() {
    try {
      if (session != null) {
        session.close();
      }
      session = new PrintWriter("filename.txt");
    } catch (IOException e) {
      throw new Error(e);
    }
  }

  public LemmaStack() {
    startProver();
  }

  @EnsuresCalledMethods(value = "session", methods = "close")
  @Override
  public void close(LemmaStack this) {
    session.close();
  }
}

None of the three suggestions in the error messages works.

• annotate its declaration with an @Owning annotation: there is no declaration of this to annotate
• extract it into a local variable : @Owning cannot be written on a local variable
• write a corresponding @CreatesMustCallFor annotation on the method that encloses this statement: that does not work for the constructor.

The message should be improved to only make suggestions that are possible.
Furthermore, this false negative warning should be eliminated.